The sickly little one was adopted by a wealthy foreigner and became a favorite.

[Raising a child + an American old-money family picking up and pampering a child + a sickly child + the darling of the family]
[There's a romantic subplot after the child grows up; it's a dual male lead storyline, so proceed with caution if you're sensitive to this.]
Throughout its short twelve-year life, Wu Tu constantly envied the happiness of others.
He didn't understand why his parents only loved his younger brother and not him.
The parents would rather drive for more than ten hours to accompany their younger brother to queue for limited-access games than listen to him say a word.
He told me he was dying.
He went to the hospital alone for treatment; he was so small he wasn't even as tall as the consultation table. He also went to a foreign country alone to try out drugs.
The black worm felt numb with pain, and its final fate would likely be to die quietly in a corner.
Unexpectedly, I met a blond foreigner with a high nose and deep-set eyes in a sharp suit abroad.
The unfamiliar, tall man from a completely different country looked into his eyes, seemed to confirm something, and said to him that he was his father.
He is his real family.
It turns out I have family.
There are also several older brothers and sisters.
I am the youngest child in my family.
But now that he's become a mixed-race child, he doesn't understand anything. He doesn't understand the family relationships that are so different from those in other countries, he can't understand the language, and he doesn't know that his father is an aristocrat, his eldest brother is the heir to the throne, his second brother is a star athlete, and the identities of his other relatives are also different.
He didn't understand that he was born to be showered with love and affection.